चित्र में, OP और 00 क्रमशः LCOA और /BOC के अर्द्धक हैं। यदि AOD = 90°, तब सिद्ध कीजिए कि
POQ = 90°
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We know that sum of adjacent angles 180°,
therefore angle AOB= angle AOD+angle DOB
180°=90°+angle DOB
angle DOB=90° .......(1)
and angle DOC=angle DOB+ angle BOC
180°=90° +angle BOC
angle BOC=90°.
angle BOC=angle BOQ + angle COQ
90°=2 angle COQ
angle COQ=45°
similarly angle POC=45°
Therefore angle POQ=angle POC+angle COQ
angle POQ=45°+45°
angle POQ=90°.
Hence proved.
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